A223138 -id:A223138

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Search: a223138 -id:a223138

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A227305

Numbers n such that sigma(n) - sigma(n-1) divides n.

+10
0

2, 3, 5, 6, 10, 19, 52, 118, 1054, 3201, 8586, 9802, 16120, 60556, 140698, 145216, 11273536, 29886160, 44868748, 8748377956, 325377469696, 2368739714188

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

a(23) > 2.5*10^12. - Giovanni Resta, Jul 13 2013

LINKS

Table of n, a(n) for n=1..22.

CROSSREFS

Cf. A053222, A067816, A223138, A225211.

KEYWORD

nonn,more

AUTHOR

Alex Ratushnyak, Jul 05 2013

EXTENSIONS

a(21)-a(22) from Giovanni Resta, Jul 13 2013

STATUS

approved

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